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Old January 08, 2013, 23:41   #92
FALaholic #: 6398
Join Date: May 2002
Location: xxx
Posts: 1,352
We should not be plastically (i.e. permanently) deforming threads.

Mark, I suspect that the barrel threads are single-point cut, and that you are seeing some effects of tool wear. Just my guess from this end of the internet...

Oh, and my vote is that IMBEL uses/used a large Brazilian monkey with a 6 foot cheater bar to tighten the barrels on. The ones I've done at least, the barrels always undertimed and fugging tiiiight on the stub.

For a given receiver an STG barrel or whatever would screw right in 'on time' and the IMBEL was undertime. I just turned the barrel shoulder on a lathe and got on with life. The up-side was that this would usually true the shoulder a bit.
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